HttpClient基本功能的使用 Get方式

HttpClient是一個功能強大、開源的HTTP客戶端庫，可以用于發(fā)送HTTP請求和處理HTTP響應(yīng)。使用HttpClient的Get方式發(fā)送請求需要以下步驟：

1. 創(chuàng)建HttpClient對象：

CloseableHttpClient httpClient = HttpClients.createDefault();

2. 創(chuàng)建HttpGet對象，并設(shè)置請求的URL：

HttpGet httpGet = new HttpGet("http://example.com/api/resource");

3. 執(zhí)行請求并獲取響應(yīng)：

CloseableHttpResponse response = httpClient.execute(httpGet);

4. 獲取響應(yīng)的狀態(tài)碼：

int statusCode = response.getStatusLine().getStatusCode();

5. 獲取響應(yīng)的內(nèi)容：

HttpEntity entity = response.getEntity();
String responseContent = EntityUtils.toString(entity, "UTF-8");

6. 關(guān)閉HttpClient和響應(yīng)：

response.close();
httpClient.close();

完整的示例代碼如下：

import java.io.IOException;
import org.apache.http.HttpEntity;
import org.apache.http.client.methods.CloseableHttpResponse;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.util.EntityUtils;
public class HttpClientExample {
public static void main(String[] args) {
CloseableHttpClient httpClient = HttpClients.createDefault();
HttpGet httpGet = new HttpGet("http://example.com/api/resource");
try {
CloseableHttpResponse response = httpClient.execute(httpGet);
try {
int statusCode = response.getStatusLine().getStatusCode();
HttpEntity entity = response.getEntity();
String responseContent = EntityUtils.toString(entity, "UTF-8");
System.out.println("Status Code: " + statusCode);
System.out.println("Response Content: " + responseContent);
} finally {
response.close();
}
} catch (IOException e) {
e.printStackTrace();
} finally {
try {
httpClient.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
}

以上代碼會發(fā)送一個GET請求到"http://example.com/api/resource"，并輸出響應(yīng)的狀態(tài)碼和內(nèi)容。請注意，這里的示例代碼沒有處理異常情況，實際使用中需要進行異常處理。